Malicious PDF — malware analysis report

Static analysis result for SHA-256 c89f81599081a67c…

MALICIOUS

PDF

74.8 KB Created: 2021-05-11 10:22:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: a3eec521c76b27f406eea58f8c2c6323 SHA-1: d4fb445ed406b5426a0515860fc551d0008f3f52 SHA-256: c89f81599081a67c1ed2e677b81935a66287ed031d8eea8ea9d36b8cf445441f
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, many pointing to disposable hosting services, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://botokaw.ru/strik?utm_term=how+to+read+a+paint+color+wheel PDF link annotation
    • https://fugesozuxi.weebly.com/uploads/1/3/0/7/130739141/xutegur-xulitamopofiki-buzolarev-gavotidipepuvir.pdfIn PDF document text
    • https://verefatodefi.weebly.com/uploads/1/3/4/7/134722939/polefiletaputu-naguwajavuzezin-faperifazu-jeloxum.pdfIn PDF document text
    • http://natfreshik.fun/what_books_are_in_the_house_of_night_serieslf415.pdfIn PDF document text
    • http://just-gopro.com/how_to_download_thinkorswim_on_iphonesz9q9.pdfIn PDF document text
    • http://sojuvofud.22web.org/barcode_maker.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dcc20dec-0195-4543-b617-cfb82efd15f0.filesusr.com/ugd/30ea26_fd959a2e694b45a6b9f55493f576da82.pdf?index=trueIn PDF document text
    • https://ce322291-b3da-4cc2-ae0f-523e25daec44.filesusr.com/ugd/4530da_1449386ccf3b4f7c996b8f707768ed62.pdf?index=trueIn PDF document text
    • http://pisibagavorinow.epizy.com/street_fighter_3_android_free.pdfIn PDF document text
    • https://153f2bed-3501-4ec5-9468-ed1987511f6d.filesusr.com/ugd/f67134_2b2291ca5ed142bc80917d9dd92a0990.pdf?index=trueIn PDF document text
    • http://ligagenaragad.rf.gd/liwemumomupibi.pdfIn PDF document text
    • http://lamekukibudinos.epizy.com/celebration_party_songs.pdfIn PDF document text
    • https://2aa0b900-127f-4603-a19a-6a731d3c9eb1.filesusr.com/ugd/5eaffa_0ef7589d38af4eaf8845f615a8f6bc81.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0143695-bb29-4dd3-bc56-32397e66a946/parts_of_speech_assessment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e32de784-e943-4d1e-a79a-f8dadf10b10a/81541436010.pdfIn PDF document text
    • https://09af0a6c-c0e6-47ff-90c1-5b173435ccd1.filesusr.com/ugd/b92b66_fbfe6336ab4e417faf3789c006632710.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C4 5036 bytes
SHA-256: 83a61fdc075bddad8cc6ec2fe535f072b09c4acfe3b6d16b0d62f8458b4c51aa
font_01_sfnt_off0000faeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEB 10472 bytes
SHA-256: a6aa0ed64d6e29df00b2dc935286591a6b191bd248dd56c9e1f73aefe718a8a5

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